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Resumen: Arrays of Ni100-xCux nanowires ranging in composition 0¿=¿x¿=¿75, diameter from 35 to 80¿nm, and length from 150¿nm to 28¿µm have been fabricated by electrochemical co-deposition of Ni and Cu into self-ordered anodic aluminum oxide membranes. As determined by X-ray diffraction and Transmission Electron Microscopy, the crystalline structure shows fcc cubic symmetry with [111] preferred texture and preferential Ni or Cu lattice depending on the composition. Their magnetic properties such as coercivity and squareness have been determined as a function of composition and geometry in a Vibrating Sample Magnetometer in the temperature range from 10 to 290¿K for applied magnetic fields parallel and perpendicular to the nanowires axis. Addition of Cu into the NiCu alloy up to 50% enhances both parallel coercivity and squareness. For the higher Cu content, these properties decrease and the magnetization easy axis becomes oriented perpendicular to the wires. In addition, coercivity and squareness increase by decreasing the diameter of nanowires which is ascribed to the increase of shape anisotropy. The temperature dependent measurements reflect a complex behavior of the magnetic anisotropy as a result of energy contributions with different evolution with temperature.
Idioma: Inglés
DOI: 10.1063/1.4890358
Año: 2014
Publicado en: Journal of Applied Physics 116 (2014), 033908 [6 pp]
ISSN: 0021-8979
Factor impacto JCR: 2.183 (2014)
Categ. JCR: PHYSICS, APPLIED rank: 42 / 141 = 0.298 (2014) - Q2 - T1
Financiación: info:eu-repo/grantAgreement/ES/MINECO/MAT2010-20798-C05-01
Tipo y forma: Artículo (Versión definitiva)
Área (Departamento): Física de la Materia Condensada (Departamento de Física de la Materia Condensada)

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Artículos > Artículos por área > Física de la Materia Condensada